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Roudi escolar (Promethichthys prometheus) — Gempylidae

Roudi escolar

Promethichthys prometheus
Family: Gempylidae
LC · Least Concern

The Roudi escolar (Promethichthys prometheus) is a saltwater fish of the family Gempylidae that grows up to 100 cm.

Length
100 cm
Water
Saltwater
Depth
80.0–800.0 m
Diet
Carnivore
Behaviour
Solitary
Activity
Nocturnal
Body shape
Torpedo-shaped
Substrate
Open water
Danger
Harmless
Range
Widespread in deep water of warm and temperate seas worldwide, above the continental slope and near seamounts.
Edibility
Commonly eaten

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Description

The roudi escolar is a slender, copper-brown deep-water predator of the family Gempylidae (snake mackerels) reaching about 1 metre. The elongate body has a large mouth full of dagger-like teeth and, as in mackerel relatives, a row of small separate finlets behind the dorsal and anal fins. The species is widely distributed in deep water of warm seas worldwide, above the continental slope and near seamounts. At night it moves higher in the water column to hunt fish, squid and crustaceans, and by day it sinks to depth. With its oily flesh it is landed as bycatch of longline and deep-water fisheries; like other snake mackerels the flesh can have a laxative effect.

Frequently asked questions

How do you recognise the Roudi escolar?

The Roudi escolar has a torpedo-shaped body, is mainly brown and shows a plain pattern. Slender, copper-brown deep-water predator with a large mouth full of dagger-like teeth and small separate fins (finlets) before the tail. Note: in tropical areas this species can cause ciguatera poisoning when eaten; large specimens of coral reef predators can accumulate the toxin. Eat with caution or avoid in risk areas.

Where does the Roudi escolar live?

The Roudi escolar lives in the sea (marine waters) and is mostly found around open water. Widespread in deep water of warm and temperate seas worldwide, above the continental slope and near seamounts.

How big does the Roudi escolar get?

The Roudi escolar grows to a maximum of about 100 cm. On average the species is around 40 cm.

Is the Roudi escolar dangerous to humans?

No, the Roudi escolar is harmless to humans. None required: this species is harmless to humans.

Is the Roudi escolar edible?

Yes, the Roudi escolar is commonly eaten.

More photos

Roudi escolar (Promethichthys prometheus) — Gempylidae — 2
Wikimedia Commons — Hugues Evano (IFREMER, Délégation océan Indien (DOI), Département Ressources Biologiques et Environnement (RBE), F-97420 Le Port, France) (CC BY 4.0)
Roudi escolar (Promethichthys prometheus) — Gempylidae — 3
Williams, Jeffrey T. (CC0 1.0) via GBIF — USNM
Roudi escolar (Promethichthys prometheus) — Gempylidae — 4
iNaturalist ((c) Jiayuan Lin, some rights reserved (CC BY-NC))
Roudi escolar (Promethichthys prometheus) — Gempylidae — 5
iNaturalist ((c) 胡正恆(Jackson Hu), some rights reserved (CC BY))
Fin

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All data

Identification

English name
Roudi escolar verified
Scientific name
Promethichthys prometheus
Family
Gempylidae
Other names
Bermuda catfish; Conejo; Promethean escolar; Rabbitfish; Night serpent; Rabbit fish; Rabbit-fish; Roudi; Sarpon; Singleline gemfish; Single-line gemfish; Snake mackerel verified

Appearance

Size class
Extra large verified
Max length (cm)
100.0 verified
Average length (cm)
40.0 verified
Body shape
Torpedo-shaped verified
Dominant colour
Brown sourced
Pattern
Plain sourced
Tail shape
Forked inferred
Mouth position
Terminal inferred
Lips
Thin inferred
Barbels
No verified
Dorsal fins
Two separate sourced
Dorsal spines
Yes verified

Habitat & distribution

Water type
Saltwater verified
Substrate
Open water verified
Min depth (m)
80.0 verified
Max depth (m)
800.0 verified
Natural range
Widespread in deep water of warm and temperate seas worldwide, above the continental slope and near seamounts. verified
Origin
Native verified

Behaviour & biology

Diet
Carnivore verified
Diet (detail)
Fishes, squid and crustaceans sourced
Social behaviour
Solitary verified
Territorial
No verified
Activity
Nocturnal inferred
Reproduction
Separate sexes verified
Sexual dimorphism
No verified
levensduur_max_jaar
11.0 sourced
Seasonality
Deep-water dweller that hunts higher in the water column at night; eggs and larvae drift in open water. sourced
Special features
Slender, copper-brown deep-water predator with a large mouth full of dagger-like teeth and small separate fins (finlets) before the tail. Note: in tropical areas this species can cause ciguatera poisoning when eaten; large specimens of coral reef predators can accumulate the toxin. Eat with caution or avoid in risk areas. verified

For anglers

Edibility
Commonly eaten verified
Fishing method
Caught mainly by commercial longline and deep-water fishing; unusual for angling sourced
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless verified
First aid
None required: this species is harmless to humans. sourced

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

More from the family Gempylidae

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